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Eyesight Protection Timer Circuit Composed of 555

2016-09-27 19:20  
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Eyesight Protection Timer Circuit Composed of 555
As shown in the figure is the eyesight protection timing circuit. This circuit uses 555 , R2, R3, R4 and C3 to constitute a pulser of variable duty ratio, which will control the bi-direction thyristor VS to make the desk lamp illume at a certain time and put out for a short time ,in order to ensure that the readers` eyes could get rest while reading to protect their eyesight.The desk lamp will put out for 10 minutes every 50 minutes.